G - Physics – 05 – B
Patent
G - Physics
05
B
341/110
G05B 11/36 (2006.01) G05B 9/02 (2006.01) G05B 11/32 (2006.01) G05D 23/20 (2006.01)
Patent
CA 1184994
Abstract The control circuit comprises a circuit consisting of a controlled plant (5) a meter (10) for the process variable, a controller (16) and a final control element (20). A signal transmitter (26) for the auxiliary process variable is provided near the input to the controlled plant (5). The output of transmitter (26) is connected to one input of a selector (30), the other input of which is connected to a function transmitter (32) in turn connected to the output of controller (16). The output of selector (30) acts on controller (16). A disturbance indicator (34) is also connected to the signal transmitter (26), and acts on the selector in such a manner that as soon as the output signal of the signal transmitter (26) falls below a bottom threshold or exceeds a top threshold at the disturbance indicator (34) the controller (16) is influenced by the function transmitter (32) instead of by the signal transmitter (26). (Fig. 1)
389327
Gowling Lafleur Henderson Llp
Sulzer Brothers Limited
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